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/* Copyright (c) 2010-2011, Michael Santos <michael.santos@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the author nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "procket.h"
#include "ancillary.h"
#define BACKLOG 50 /* default backlog for TCP connections */
int procket_open_fd(PROCKET_STATE *ps);
int procket_check_devname(char *dev, size_t len);
int procket_pipe(PROCKET_STATE *ps);
int procket_open_socket(PROCKET_STATE *ps);
int procket_create_socket(PROCKET_STATE *ps);
int procket_lookup_socket(PROCKET_STATE *ps);
int procket_open_dev(PROCKET_STATE *ps);
int procket_open_char_dev(char *dev);
void error_result(PROCKET_STATE *ps, int err);
void usage(PROCKET_STATE *ep);
enum {
PROCKET_FD_SOCKET,
PROCKET_FD_CHARDEV
};
int
main(int argc, char *argv[])
{
PROCKET_STATE *ps = NULL;
int ch = 0;
ps = calloc(1, sizeof(PROCKET_STATE));
if (ps == NULL)
error_result(ps, errno);
ps->backlog = BACKLOG;
ps->family = PF_UNSPEC; /* bind IPv4 and IPv6 socket */
ps->type = SOCK_STREAM;
ps->protocol = IPPROTO_TCP;
ps->fdtype = PROCKET_FD_SOCKET;
while ( (ch = getopt(argc, argv, "b:d:F:hI:p:P:T:u:v")) != -1) {
switch (ch) {
case 'b': /* listen backlog */
ps->backlog = atoi(optarg);
break;
case 'F': /* socket family/domain */
ps->family = atoi(optarg);
break;
case 'u': /* path to Unix socket */
ps->path = strdup(optarg);
if (ps->path == NULL)
error_result(ps, errno);
if (strlen(ps->path) >= UNIX_PATH_MAX)
error_result(ps, ENAMETOOLONG);
break;
case 'p': /* port */
ps->port = strdup(optarg);
if (ps->port == NULL)
error_result(ps, errno);
if (strlen(ps->port) >= NI_MAXSERV)
error_result(ps, ENAMETOOLONG);
break;
case 'P': /* socket protocol */
ps->protocol = atoi(optarg);
break;
case 'T': /* socket type */
ps->type = atoi(optarg);
break;
case 'I': /* Interface name */
ps->ifname = strdup(optarg);
if (ps->ifname == NULL)
error_result(ps, errno);
if (strlen(ps->ifname) >= IFNAMSIZ)
error_result(ps, ENAMETOOLONG);
break;
case 'd': /* Open a character device */
ps->dev = strdup(optarg);
if (ps->dev == NULL)
error_result(ps, errno);
if (procket_check_devname(ps->dev, 32) < 0)
usage(ps);
ps->fdtype = PROCKET_FD_CHARDEV;
break;
case 'v':
ps->verbose++;
break;
case 'h':
default:
usage(ps);
}
}
argc -= optind;
argv += optind;
if (ps->path == NULL)
error_result(ps, ENOENT);
if (argc > 0) {
ps->address = strdup(argv[0]);
if (ps->address == NULL)
error_result(ps, errno);
if (strlen(ps->address) >= NI_MAXHOST)
error_result(ps, ENAMETOOLONG);
}
if (procket_open_fd(ps) < 0)
error_result(ps, errno);
if ( (setgid(getgid()) < 0) || (setuid(getuid()) < 0))
error_result(ps, errno);
if (procket_pipe(ps) < 0)
error_result(ps, errno);
exit(0);
}
int
procket_open_fd(PROCKET_STATE *ps)
{
switch (ps->fdtype) {
case PROCKET_FD_SOCKET:
return procket_open_socket(ps);
case PROCKET_FD_CHARDEV:
return procket_open_dev(ps);
default:
return -1;
}
}
int
procket_check_devname(char *dev, size_t len)
{
char *p = NULL;
if (strlen(dev) >= len)
return -1;
for (p = dev; *p; p++) {
if (!isascii(*p) && !isalnum(*p) && *p != '/')
return -1;
}
return 0;
}
int
procket_open_socket(PROCKET_STATE *ps)
{
switch (ps->protocol) {
case IPPROTO_TCP:
case IPPROTO_UDP:
if (procket_lookup_socket(ps) < 0)
return -1;
break;
default:
if (procket_create_socket(ps) < 0)
return -1;
break;
}
return 0;
}
int
procket_lookup_socket(PROCKET_STATE *ps)
{
struct addrinfo hints = {0};
struct addrinfo *res = NULL;
struct addrinfo *rp = NULL;
int err = 0;
hints.ai_family = ps->family;
hints.ai_socktype = ps->type;
hints.ai_protocol = ps->protocol;
hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV | AI_PASSIVE;
err = getaddrinfo(ps->address, ps->port, &hints, &res);
switch (err) {
case 0:
break;
case EAI_SYSTEM:
return -1;
/* fake errno values */
#ifdef EAI_ADDRFAMILY
case EAI_ADDRFAMILY:
errno = EAFNOSUPPORT;
return -1;
#endif
case EAI_AGAIN:
errno = EAGAIN;
return -1;
case EAI_FAMILY:
errno = EPFNOSUPPORT;
return -1;
case EAI_MEMORY:
errno = EAI_MEMORY;
return -1;
case EAI_SERVICE:
case EAI_SOCKTYPE:
errno = ESOCKTNOSUPPORT;
return -1;
default:
errno = EINVAL;
return -1;
}
for (rp = res; rp != NULL; rp = rp->ai_next) {
ps->family = rp->ai_family;
ps->type = rp->ai_socktype;
ps->protocol = rp->ai_protocol;
if (procket_create_socket(ps) == 0) {
if (bind(ps->s, rp->ai_addr, rp->ai_addrlen) < 0)
return -1;
break;
}
}
freeaddrinfo(res);
if (ps->s < 0)
return -1;
return 0;
}
int
procket_create_socket(PROCKET_STATE *ps)
{
int flags = 0;
ps->s = socket(ps->family, ps->type, ps->protocol);
if (ps->s < 0)
return -1;
#ifdef SO_BINDTODEVICE
if (ps->ifname) {
struct ifreq ifr;
(void)snprintf(ifr.ifr_name, IFNAMSIZ, "%s", ps->ifname);
if (setsockopt(ps->s, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0)
return -1;
}
#endif
flags = fcntl(ps->s, F_GETFL, 0);
if (flags < 0)
goto ERR;
if (fcntl(ps->s, F_SETFL, flags|O_NONBLOCK) < 0)
goto ERR;
return 0;
ERR:
if (ps->s > -1) {
int err = errno;
(void)close(ps->s);
errno = err;
ps->s = -1;
}
return -1;
}
int
procket_pipe(PROCKET_STATE *ps)
{
struct sockaddr_un sa = {0};
int s = -1;
(void)memcpy(sa.sun_path, ps->path, sizeof(sa.sun_path)-1);
sa.sun_family = PF_LOCAL;
if ( (s = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0)
return -1;
if (connect(s, (struct sockaddr *)&sa, sizeof(sa)) < 0)
return -1;
if (ancil_send_fd(s, ps->s) < 0)
return -1;
if (close(s) < 0)
return -1;
return 0;
}
/* character device support */
int
procket_open_dev(PROCKET_STATE *ps)
{
char dev[MAXPATHLEN] = {0};
int i = 0;
if (ps->dev == NULL) {
errno = ENXIO;
return -1;
}
(void)snprintf(dev, sizeof(dev), "/dev/%s", ps->dev);
ps->s = procket_open_char_dev(dev);
if (ps->s > -1)
return 0;
switch (errno) {
case ENOENT:
break;
default:
return -1;
}
for (i = 0; i < 255; i++) {
(void)snprintf(dev, sizeof(dev), "/dev/%s%d", ps->dev, i);
ps->s = procket_open_char_dev(dev);
if (ps->s > -1)
return 0;
switch (errno) {
case EBUSY:
break;
default:
return -1;
}
}
return -1;
}
int
procket_open_char_dev(char *dev)
{
int fd = -1;
struct stat buf = {0};
int err = 0;
int flags = 0;
if ( (fd = open(dev, O_RDWR)) < 0)
return -1;
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0)
goto ERR;
if (fcntl(fd, F_SETFL, flags|O_NONBLOCK) < 0)
goto ERR;
/* Test the file is a character device */
if (fstat(fd, &buf) < 0)
goto ERR;
if (!S_ISCHR(buf.st_mode)) {
errno = ENOENT;
goto ERR;
}
return fd;
ERR:
if (fd > -1) {
err = errno;
(void)close(fd);
errno = err;
}
return -1;
}
void
error_result(PROCKET_STATE *ps, int err)
{
if (ps->verbose > 0)
(void)fprintf(stderr, "%s", strerror(err));
exit(err);
}
void
usage(PROCKET_STATE *ps)
{
(void)fprintf(stderr, "%s, %s\n", __progname, PROCKET_VERSION);
(void)fprintf(stderr,
"usage: %s <options> ipaddress>\n"
" -u <path> path to Unix socket\n"
" -p <port> port\n"
" -F <family> family [default: PF_UNSPEC]\n"
" -P <protocol> protocol [default: IPPROTO_TCP]\n"
" -T <type> type [default: SOCK_STREAM]\n"
#ifdef SO_BINDTODEVICE
" -I <name> interface [default: ANY]\n"
#endif
" -d <name> open device\n"
" -v verbose mode\n",
__progname
);
exit(-1);
}
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